Explain that the resistance of an ohmic conductor remains constant as the current changes, provided the temperature remains constant, meaning current is directly proportional to potential difference.
Describe how the resistance of components such as filament lamps, diodes, thermistors, and light-dependent resistors (LDRs) changes with the current through them.
Understand that the resistance of a filament lamp increases as its temperature rises.
Explain that a diode has a very high resistance in the reverse direction, allowing current to flow in only one direction.
Describe how the resistance of a thermistor decreases as temperature increases, and recognize its application in circuits such as thermostats.
Describe how the resistance of an LDR decreases as light intensity increases, and recognize its application in circuits such as automatic lighting.
Design and utilize a circuit to measure the resistance of a component by measuring the current through it and the potential difference across it, drawing the appropriate circuit diagram.
Analyze graphs to determine whether circuit elements are linear or non-linear, relating the produced curves to the component's function and properties.
Conduct practical investigations to determine the I-V characteristics of various circuit elements, including a filament lamp, a diode, and a resistor at a constant temperature.
Investigate the relationships between thermistor resistance and temperature, as well as LDR resistance and light intensity.
